I am sorry you are going through this and yet glad you have the courage to remove yourself and your children from this chaotic and dangerous environment of active addiction.
The fact that he blames you for not being "supportive" speaks volumes. He is not yet ready to own his bad choices and addiction.
If I can suggest one thing it would be to surround yourself with support, here and at live meetings if possible. You have some rough roads ahead and may need people who understand.
Now would be a good time to see a lawyer and know what your rights are. And yes, documenting dates and actions may help you in the process of taking good care of your children.
Hugs